package com.spring.boot.standard.admin.service.impl;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.domain.Example;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.domain.Specification;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
import com.spring.boot.standard.admin.common.utils.GsonUtil;
import com.spring.boot.standard.admin.dao.UserRepository;
import com.spring.boot.standard.admin.entity.User;
import com.spring.boot.standard.admin.service.UserService;

/**
 * @author qinhao
 * @since Fri Sep 03 08:07:51 UTC 2021
 */
@Service
@EnableTransactionManagement
public class UserServiceImpl implements UserService {
	
    @Autowired
    private UserRepository userRepository;

    @SuppressWarnings("serial")
	@Override
	public Page<User> findAll(Pageable pageable,Object[] args) {
		Page<User> result = userRepository.findAll(new Specification<User>() {
	        @Override
	        public Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
				//List<Predicate> list = new ArrayList<Predicate>(); 多条件搜索的写法
				if (!StringUtils.isEmpty(args[0]) && !StringUtils.isEmpty(args[1])) {
					/**多条件搜索的写法
					list.add(cb.like(root.get("userid").as(String.class), "%" + args[0] + "%"));
					list.add(cb.like(root.get("username").as(String.class), "%" + args[0] + "%"));
					list.add(cb.like(root.get("password").as(String.class), "%" + args[0] + "%"));
					Predicate[] p = new Predicate[list.size()];
					return cb.or(list.toArray(p));*/
					return cb.like(root.get(args[0].toString()).as(String.class),"%" + args[1] + "%");
				}else{
					return null;
				}
	        }
	    }, pageable);
	    return result;
	}

	@Override
	public List<User> findList() {
    	return userRepository.findAll();
	}

	@Override
	public User findById(String userid) {
		return userRepository.findById(userid).get();
	}

	@Override
	public User findByUsername(String username) {
		User user = new User();
		user.setUsername(username);
		Example<User> example = Example.of(user);
		try {
			return userRepository.findOne(example).get();
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
	}

	@Override
	public void deleteById(String userid) {
		userRepository.deleteById(userid);;
	}

	@Override
	public User save(User user) {
		return userRepository.save(user);
	}

	@Override
	@Transactional(rollbackFor = Exception.class)
	public int saveFromList(List<Map<String,String>> list) throws Exception {
		int i=0;
		List<User> userlist = new ArrayList<User>();
		for(Map<String,String> map:list){
			User user = GsonUtil.getGson().fromJson(GsonUtil.getGson().toJson(map),User.class);
			userlist.add(user);
		}
		for(User user:userlist){
			userRepository.save(user);
			i++;
		}
		return i;
	}

	public String getToken(User user) {
		String token="";
		token= JWT.create().withAudience(user.getUsername())
				.sign(Algorithm.HMAC256(user.getPassword()));
		return token;
	}
    
}
